摘要
为探究石漠化地区土壤湿度时空变化及其影响因素,以贵州典型石漠化区域为研究区,基于欧洲中期天气预报中心的ERA5土壤湿度再分析资料、贵州省气象站点数据以及MODIS/NDVI数据,采用一元线性回归、Mann-Kendall突变检验、Pearson相关分析及偏相关分析,分析了贵州典型石漠化区域土壤湿度不同时间尺度下的时空变化特征,揭示了土壤湿度的主要驱动因素。得出如下结论:(1)2000-2017年研究区土壤湿度总体呈下降趋势,但在冬季呈微弱上升趋势,表现为“南高北低”的空间分布特征;(2)研究区年际、春季突变点均在2000年左右,夏季和秋季突变则发生在2015年前后,大部分均为下降突变点;(3)不同时间尺度下,土壤湿度与不同因子表现出不同的相关性。土壤湿度与降水的相关性整体更强,而相对湿度在季节上的相关性强于其他因素,而温度则对土壤湿度呈现抑制作用,NDVI在各时间尺度上未表现出明显作用;(4)排除降水影响后,土壤湿度与温度间的负相关性有所增强,相对湿度对土壤湿度的影响整体减小,但在春季和月尺度上,其对土壤湿度的影响依然较大,NDVI则无明显变化。
In order to explore the temporal and spatial variation of soil moisture in rocky desertification areas and its influencing factors,a typical rocky desertification area in Guizhou was taken as the research area.Based on the ERA5 soil moisture reanalysis data of the European Medium-term Weather Forecast Center,the meteorological station data of Guizhou Province and the MODIS/NDVI data,the linear regression,Mann-Kendall mutation testing methods,Pearson correlation analysis and partial correlation analysis were used to analyze the temporal and spatial variation characteristics of soil moistureunder different time scales in typical rocky desertification areas of Guizhou,and the main driving factors of surface soil moisture change was revealed.The conclusions were as follows:(1)from 2000 to 2017,the soil moisture in the study area showed a decreasing trend as a whole,but it shows a slight increase trend in winter,which was high in the south and low in the north region;(2)the interannual,spring mutation points in the study area were around 2000,and the summerand fall mutations occurred around 2015,and most of them were descending mutation points;(3)under different time scales,soil moisture and different factors show different correlations.The correlation of soil moisture with precipitation is stronger,while the relative humidity is stronger seasonally,and temperature has an inhibitory effect on soil moisture.NDVI has no obvious effect under different time scales;(4)after excluding the influence of precipitation,the correlation between soil moisture and temperature increased,the influence of relative humidity on soil moisture is reduced overall,butits influence on soil moisture is still relatively largeon spring and monthly scales,NDVI has no significant change.
作者
赵飞飞
张显云
付婷
聂士海
ZHAO Feifei;ZHANG Xianyun;FU Ting;NIE Shihai(Mining Colllege,Guizhou University,Guiyang 550025,China)
出处
《国土与自然资源研究》
2021年第4期38-43,共6页
Territory & Natural Resources Study
基金
国家自然科学基金(41701464,41901225)
贵州省科技计划项目(黔科合基础[2017]1054,[2017]1026,[2016]1028)
贵州大学引进人才科研项目(贵大人基合字(2016)51号(2015)28号)。
关键词
土壤湿度
时空变化
M-K检验
气象因子
植被覆盖
soil moisture
spatiotemporal change
M-K test
meteorological factors
vegetation coverage
